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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ee50273c24e995fd6dee816d6a05e57a6bb5aa5a502dd63ad19cb6639beda4' 
  AND token = 'b63XwoUmUL9vjlaJ7ldFOIxz7GkWvgGEOl0yjNe4Ae8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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