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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da990dd5ff992e9f543c89de2820c6e6d4ddfe56adbf3dc68ff1f81eb173b9af' 
  AND token = '5l7Gf/FprtWOLwInaiSaMQVwfvVrhpMmp32ZDbbcmRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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