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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25715ef9a5d575e6b9a41e57d7a5ec654ed0cf88d4311491e86358929ca9b2df' 
  AND token = 'xCL5+8UNaq0DvBBzzQxn22gaXo/fU56A0CKmANKFO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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