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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883cd1eb497d3561e4e588af13c48b7e5992b12a8eddfdec649815d09633edf9' 
  AND token = '87EGP3/FuHy1QoG41SbMbZbsg4wdMS0LLqWd/lRIPSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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