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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddc21f15bd362d7f5da93f227d4c964938b2e2d20ea0abc9be8ad6d0bb0c5a2' 
  AND token = 'tLkk7uA05sSbf9O12dRxytJTuwOIBRzg36/o51roC/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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