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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08867e4c95ba26e45392ad3db5b5946eef440931da84839a3e9085eaf7105ffd' 
  AND token = '3yKSDM/1lefz0D3d/pxBM80RS2v9tbsOe3J2BjMbloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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