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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13352dff3eddf0685c71e34e31610033af8e0e8a294cb04b46398ad0230966' 
  AND token = 'Q0Vn515PefiN+uUXFdGAAmX6ExUUv/KxEyxBGghhHLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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