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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8dd81668c2ba1541437df5d397d1661e4d44577475331dd6ce78f0a69fc0f30' 
  AND token = 'Vw70469JSQyVSK1KMUrx37gXX8j6a9HUIjUUxH2rMKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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