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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ffc787f6ebe5395133aae5ba163009718a0699f9791728e0b98e194a7e0c8b' 
  AND token = 'xOZYFCaWOOF0sAy/pmTTfxuWnU0kdLegXLljeZlCwWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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