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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04159bcc5f3ee384328d2328a352be8fe8385674ad19b9f84436929b8e2190b1' 
  AND token = '7OScDYkC4B7KbA4OiRjFxd+NidOijtHTi9Bdq13oYjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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