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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce51b2109df486a12c2b9c05f0c36e598301b08a6a479d9e97b32a45990aad55' 
  AND token = '6codrEnW6fU8rlnMLwejmHYGsEHJaRI8q34V5+x+MKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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