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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31d854a1e633959ea508d58ff2855426f5adf27a1e83887556d33be902eb19f' 
  AND token = 'mfSbDrTBcG9ra7qmqpma+zHtvXKIOYuMCrnqrTUb6eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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