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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f341bc21c643de910561e191270327d1e38ca09900b00f71091c9c9dc00291a9' 
  AND token = '9Bbibxq9n/NXqcuHjXHjhud0lQG7ay5Vj38wlvVR/dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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