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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ebb8bdca5fac9decfd3946e564bcfe5ce09af3a3de8fe83356459c10fb6ec4' 
  AND token = '7WRgswfIpwo/3yEU3oC4M5JH89Yk2XigtiNdj4gIWfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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