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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c417b6761bbdde9b1f6c9ec5cbc5e6a261306e5eabb7129120691d506d50383' 
  AND token = 'kcsbFBGdNyNKp4bL481w8kXG6CR5YTOG+opAML/klbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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