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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a387951b931572cd2dcb9f0344767c4d92f3ecea2a9cdb0aeae75b0656d0e12' 
  AND token = 'w7c98EA2VEuVghcE0nYvFMtV4LzA97W9cujJEqFXiC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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