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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa03b71c6c2723fde55dc86cd10920ce83f3f05bf85be04aa3cc81a61686575' 
  AND token = 'Wp8MBNMdQqdxcubApspwwbra+n6ACj3fqNEKTazXHIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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