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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f77f9d9f840deca1468a28edaf555d22d0277930677015bff158e66b0445f0b' 
  AND token = '9FG7Lsen0qsc++y+AYW4rUq/auu0iyLrPEyFjwDQtg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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