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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b7c0259bf11fe84582f25db920ce1b1d0a1ad6c038ee9156674d14b1e91d87' 
  AND token = 'JbEMSMFqwaqwd3u8Fc22eLnCMArgg7hf8inmxPO0hmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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