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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957dc862e7829fd1d22e9976c1543c8def06d6d3845e66f15136ce7ba7d2d666' 
  AND token = 'HBqI5dfRzrTGYtDrqud0XYkyasqujuZqd0oj3R5PFHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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