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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b10a5ba806e337c4ec3f2cc90e6fe6e6f4ff1a4343b5ec362b531f86fdb07e9' 
  AND token = 'liF+qd4khU0Skxbv17ITesW5Uss9Ynb8K1+XXipV72Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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