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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c76f8af7c26b66e6e29f3f621c90a1cf69500985c72b7582616497edf7b717' 
  AND token = 'T2oLQ7fmFGQOB3fz7lEz37p5Zwwv0NUjMd9NEfTBCb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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