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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd5187d07a8211e42e0876947c20670dd834c752927a701fe7f8eb3ca2c164e' 
  AND token = 'h6lPPGC9Cz9C8FwCXw0X+fx7Du7YOww/veFg8BH2BG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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