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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a2dcf29bbfbb72f82cc22e97f4af3abe8ee4f6b7daa612ae2981df70ba9672' 
  AND token = 'FG3Nz7+7DSC0iXfJmY2NaIqkdAjYSpVAp765nTqFNJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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