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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52aeeb0ec3bc59a334ea88153b5c9c4344e13d065289b3bedd23173c2f2d13b' 
  AND token = '+fQULV/uVhW0M/YpHjia/OZmep1DkI2X6mk2uyLV2Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.16487

JSON explain

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