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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88309271507637a4490d7ba06f18c1641dc8e2619a46611bf77e37464029699' 
  AND token = 'e2kV2vCO1oHgZpx3i/0x/duN0t2kxb+5n7kAuCSY1NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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