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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85362cf78558636a56d345534c035955b87826ea4f5998761fa78e4053775ab' 
  AND token = 'dS8daJ/F1vOR2lcnMa46N37VPMfQLbqpBvvybzjj2SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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