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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e022800db812300c73da3cc47b4d7464b178d87e28c24209c3cc5aa8b86927d5' 
  AND token = 'MWO6hcq7KoRRKZNKclSp5fg4oAZLT4GHzFXI26+UUWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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