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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f7c74f97eb764945572a9fc58d33ed47129bf37f88d80f58537f573ef7d3de' 
  AND token = '1PCGUEdMNUAZF2dtD7/OBPcQR4/82UzJkfcgIgNSK7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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