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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0524ac6b2f8e4317c0d1957266a2d768227904be91482056b2a2659750985c' 
  AND token = 'ulNtI8Qvsdu4Kyd5cwPmTnJlNmmUgUzal5QXJiSK/g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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