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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d573b560cf0b59514fc99b5de8d2d6f14528146ca19de10dfe489db9c7fc21' 
  AND token = 'H1/ftvBbpy7z8QPplUTb2DP2UsJ16O6QvDESIgCPfbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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