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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a467d395233d17f7245bb4dc6610cc0ece15ba3c4c35705fab6ca0b35b7aa2b3' 
  AND token = 'DH2UunMbu8lwWEtgkDxptnFOpTADUbR7+LYoFspdcPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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