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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa42e18062e5cd22ad13fd5bd7683a2146147f7f94a1d3903f0ff03dc00d37a' 
  AND token = 'M+e7Ka9fzWkPs+XCnJhEa3Y2UP8p0Vegn58Yg5RACnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}