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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6e4757836e93b8cfd892a309d1068b88209887e48b59861fe9b796f166ada4' 
  AND token = 'AVMDUQUk7RI0vV1RVttRffdP6MRca8FlBB7Fye8/prs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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