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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364025d690f3c2069aa61ef92672596fdbc76619471152c5ea44cc925d4b1333' 
  AND token = 'ftDad2dKgignY8uD7qyFZG+JHUPeEZw7Nbumn0Gde0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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