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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88eaac1ef48596db8888cea48807d68b690248700ac5e08cf195f9d8ad03d9b3' 
  AND token = 'iy4A6q3kok5x7MdIYR3TCINXB/WcNsd7jfq17vxh2hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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