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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e1bc6757d7d1088ac2830534e7ab0914a7a786b1e6722c3c3d7ea3a7503d0d' 
  AND token = 'nYHByBiro3InS6UypR2d4qSd+fGySOCyNI7vuKNzfR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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