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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab297f572bed80a569f1d53b3adeaaa5f3e19ad2512f2ce80604925e1833420' 
  AND token = '9S9tM+/Oscnvg01Qhrda9JaSWSWW/v7rwr1071MNrvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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