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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803695827025a386147ad177f440c019936c3e268b900606b772daea07d6237c' 
  AND token = '8IcHXxuYE/G3m4WKt8o6Q0Xiv1754HbWLl/LMw+u8w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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