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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdf2126c633080f9b706c91816ba492ea2bff9da6788a435b70aed4c9f40ec3' 
  AND token = 'oH1/cjzI2IaDkCIyOcR612EYpOcNhno30opzLSpLyig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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