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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905b2b3ceac7d68d723158a7defc3aa693fa0eee82c6c7860c832a14fbb38b57' 
  AND token = 'BIt3A48eVUIqrd9scOLssDLtKt6TPqlT8sqeHBsrVsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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