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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a930966aed00956abe2f578193b9633c446ff7cc04b1b7f3825fd0197089d9e6' 
  AND token = 'sFeVFgcDuJzZu1rFHSGqffV6amei1m/oCIAuuLdpqpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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