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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32808ed85ff08e2a83dbd24e771127011809b0084a4e4e7829fcefcc8076ce1e' 
  AND token = 'mQafXBqONMV8A1+5yr6he7nnPdLqXJ6ewviwwB6uUl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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