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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d84060dc85da9620682494d617940bd2572d399c9967ff91ea4a4689b210114' 
  AND token = 'enZ9lkU9+9Ww3a2IgonTlWFierCUQFWPsLlkGm3JGSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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