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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee798248dcd17e8d1661d9e1f71822ed3abbee770dafee02b17baf6f3b6af32a' 
  AND token = 'aFiMW5g4c/WA9kGkcP+T0ZaAHJaUL7bV5WKSph0zrL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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