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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9237a02ff30f00734f230efa3386d1e9e9267e542fc0b7afe5c3b429fe5b903e' 
  AND token = 'pf9latLNv+mqYkWEDOVD8NLf4Lr9Ap+Uq9z8FH+iZas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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